package ysoserial.payloads;


import org.reflections.Reflections;
import ysoserial.GeneratePayload;

import java.lang.reflect.Modifier;
import java.util.Iterator;
import java.util.Set;


@SuppressWarnings("rawtypes")
public interface ObjectPayload<T> {

    /*
     * return armed payload object to be serialized that will execute specified
     * command on deserialization
     */
    public String getObject(String platform) throws Exception;

    public static class Utils {

        // get payload classes by classpath scanning
        public static Set<Class<? extends ObjectPayload>> getPayloadClasses() {
            final Reflections reflections = new Reflections(ObjectPayload.class.getPackage().getName());
            final Set<Class<? extends ObjectPayload>> payloadTypes = reflections.getSubTypesOf(ObjectPayload.class);
            for (Iterator<Class<? extends ObjectPayload>> iterator = payloadTypes.iterator(); iterator.hasNext(); ) {
                Class<? extends ObjectPayload> pc = iterator.next();
                if (pc.isInterface() || Modifier.isAbstract(pc.getModifiers())) {
                    iterator.remove();
                }
            }
            return payloadTypes;
        }


        @SuppressWarnings("unchecked")
        public static Class<? extends ObjectPayload> getPayloadClass(final String className) {
            Class<? extends ObjectPayload> clazz = null;
            try {
                clazz = (Class<? extends ObjectPayload>) Class.forName(className);
            } catch (Exception e1) {
            }
            if (clazz == null) {
                try {
                    return clazz = (Class<? extends ObjectPayload>) Class
                        .forName(GeneratePayload.class.getPackage().getName() + ".payloads." + className);
                } catch (Exception e2) {
                }
            }
            if (clazz != null && !ObjectPayload.class.isAssignableFrom(clazz)) {
                clazz = null;
            }
            return clazz;
        }


        public static Object makePayloadObject(String payloadType, String platform) {
            final Class<? extends ObjectPayload> payloadClass = getPayloadClass(payloadType);
            if (payloadClass == null || !ObjectPayload.class.isAssignableFrom(payloadClass)) {
                throw new IllegalArgumentException("Invalid payload type '" + payloadType + "'");

            }

            final Object payloadObject;
            try {
                final ObjectPayload payload = payloadClass.newInstance();
                payloadObject = payload.getObject(platform);
            } catch (Exception e) {
                throw new IllegalArgumentException("Failed to construct payload", e);
            }
            return payloadObject;
        }


        @SuppressWarnings("unchecked")
        public static void releasePayload(ObjectPayload payload, Object object) throws Exception {
            if (payload instanceof ReleaseableObjectPayload) {
                ((ReleaseableObjectPayload) payload).release(object);
            }
        }


        public static void releasePayload(String payloadType, Object payloadObject) {
            final Class<? extends ObjectPayload> payloadClass = getPayloadClass(payloadType);
            if (payloadClass == null || !ObjectPayload.class.isAssignableFrom(payloadClass)) {
                throw new IllegalArgumentException("Invalid payload type '" + payloadType + "'");

            }

            try {
                final ObjectPayload payload = payloadClass.newInstance();
                releasePayload(payload, payloadObject);
            } catch (Exception e) {
                e.printStackTrace();
            }

        }
    }
}
